dsh-text-tools: String Processing and Statistics Tools

`dsh-text-tools` is a pure Node.js plugin maintained by uckkk, designed to address the need for local text processing in DSH agent development. The plugin runs without an internet connection and provides two core features: string style conversion (supporting case, camelCase, snake_case, kebab-case, and Slug formats) and text statistics (characters, words, lines, and bytes). Users can install it using `dsh plugin add` and enable it in their profile. To use it, simply call the registered tool functions, such as `text_transform`. Because the plugin involves running third-party code locally, please review the source code before use to ensure security and compliance.